feat: move the extRuntime into getExtRuntime

[crazyurus]

Details

This PR will move the extRuntime into getExtRuntime. Because when the user has not installed the extension and the installation is completed, extRuntime already exists. However, the current extRuntime still an undefined value, and it is impossible to judge whether the installation is completed based on this.

After modification, extRuntime can be obtained in real time.

Code of Conduct

• [x] I agree to follow this project's Code of Conduct
• [x] I agree to license this contribution under the MIT LICENSE
• [x] I checked the current PR for duplication.

Contacts

• Discord ID: crazyurus